Question

To keep homemade ice cream frozen, it is placed in a bucket of ice-water and salt mixture. A mixture is commonly composed of 1.90 kg of salt (NaCl) and 7.25 kg of ice.

Problem: Calculate the mole fraction of NaCl in the mixture until the ice melts.

Answer 1

Molar mass of NaCl$=58.44g/mol$

Molar mass of water$=18.01528g/mol$

Moles of NaCl$=\frac{1.90}{58.44}=0.032512$

Moles of Ice $=\frac{7.25}{18.01528}=0.402436$

Total fraction$=\frac{0.032512}{(0.032512+0.402436)}$

$=0.074749$

$=7.4749\%$